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Related Experiment Video

Updated: Mar 2, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Published on: April 4, 2017

Complete linear optical isolation at the microscale with ultralow loss.

JunHwan Kim¹, Seunghwi Kim¹, Gaurav Bahl²

¹Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois, USA.

Scientific Reports

|May 10, 2017

Summary

Researchers developed a magnet-free method for optical isolation using a microresonator. This breakthrough enables chip-scale integration of nonreciprocal devices, overcoming previous limitations in photonics.

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Last Updated: Mar 2, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

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Area of Science:

Photonics and Optical Engineering
Materials Science
Quantum Optics

Background:

Low-loss optical isolators and circulators are essential for optical systems but challenging to integrate onto chips using standard processes.
Existing magneto-optic approaches face integration hurdles, driving the need for magnet-free alternatives.
Current magnet-free methods lack ideal characteristics like large contrast and ultralow loss on a microscale, hindering photonic integration.

Purpose of the Study:

To demonstrate a novel, magnet-free approach for achieving complete linear optical isolation.
To enable chip-scale integration of nonreciprocal optical components with high performance.
To explore alternative mechanisms beyond traditional magneto-optic effects for optical isolation.

Main Methods:

Utilizing a whispering-gallery microresonator coupled to a dielectric waveguide.
Employing a single-frequency laser to pump the microresonator system.
Leveraging coherent light-sound interaction via traveling-wave Brillouin scattering to break time-reversal symmetry.

Main Results:

Achieved complete linear optical isolation within any dielectric waveguide.
Demonstrated isolation based on nonreciprocal induced transparency.
Showcased a microscale footprint with high contrast and ultralow forward loss.

Conclusions:

Optical isolation is achievable in a material-agnostic and wavelength-agnostic manner using microresonators.
The demonstrated method offers a practical pathway for integrating nonreciprocal functions into chip-scale photonic devices.
Coherent light-sound interaction provides a viable alternative to magneto-optic effects for on-chip optical isolation.